Table 1 Open in new tab Means (in µV)...

ERP variable	All subjects	MZ	DZ	Main effect of emotion F (2, 910)	η_p²	Pleasant vs neutral t(455)	Unpleasant vs neutral t(455)
EPN (175–275 ms) Oz							195.66	0.30	19.84	12.81
Pleasant	1.55	4.77	1.62	4.73	1.48	4.82
Neutral	3.55	4.65	3.57	4.59	3.53	4.71
Unpleasant	2.21	4.90	2.29	4.83	2.13	4.98
P300 (300–600 ms) Pz							697.43	0.65	33.68	33.86
Pleasant	10.18	5.62	10.37	5.57	9.99	5.68
Neutral	4.60	4.91	4.59	4.90	4.61	4.93
Unpleasant	10.98	5.83	11.00	5.94	10.96	5.72
P300 (300–600 ms) Fz							369.64	0.44	24.17	22.60
Pleasant	2.71	7.29	2.99	7.43	2.41	7.15
Neutral	−2.69	6.51	−2.65	6.73	−2.72	6.29
Unpleasant	2.24	7.17	2.12	7.22	2.37	7.13
LPP (600–1000 ms) Pz							683.48	0.66	29.77	35.64
Pleasant	7.36	4.74	7.37	4.54	7.36	4.95
Neutral	2.01	4.01	1.92	4.19	2.11	3.81
Unpleasant	9.59	5.32	9.54	5.05	9.64	5.60
LPP (600–1000 ms) Fz							291.03	0.40	19.67	22.42
Pleasant	5.56	6.84	5.83	6.57	5.27	7.12
Neutral	0.43	6.04	0.32	6.26	0.54	5.81
Unpleasant	6.41	6.98	6.46	6.88	6.35	7.10
LPP (1000–2000 ms) Pz							199.78	0.33	14.38	19.30
Pleasant	3.24	4.18	3.36	4.06	3.11	4.30
Neutral	0.78	3.38	0.71	3.31	0.86	3.46
Unpleasant	4.33	4.43	4.37	4.14	4.29	4.71
LPP (1000–2000 ms) Fz							74.82	0.14	9.05	11.72
Pleasant	5.07	5.75	5.17	5.65	4.96	5.87
Neutral	2.69	5.04	2.49	5.10	2.90	4.98
Unpleasant	5.65	5.84	5.58	5.54	5.72	6.16
LPP (2000–3000 ms) Pz							58.33	0.12	8.85	9.69
Pleasant	1.87	3.89	2.00	3.89	1.73	3.90
Neutral	0.24	3.34	0.21	3.41	0.27	3.26
Unpleasant	2.12	4.13	2.07	3.93	2.18	4.33
LPP (2000–3000 ms) Fz							16.31	0.03	5.38	4.04
Pleasant	4.71	5.19	4.90	5.38	4.50	4.99
Neutral	3.25	4.65	3.11	4.95	3.41	4.31
Unpleasant	4.26	5.39	4.20	5.08	4.32	5.70

ERP variable

All subjects

Main effect of emotion F (2, 910)

η_p²

Pleasant vs neutral t(455)

Unpleasant vs neutral t(455)

EPN (175–275 ms) Oz

195.66

0.30

19.84

12.81

Pleasant

1.55

4.77

1.62

4.73

1.48

4.82

Neutral

3.55

4.65

3.57

4.59

3.53

4.71

Unpleasant

2.21

4.90

2.29

4.83

2.13

4.98

P300 (300–600 ms) Pz

697.43

0.65

33.68

33.86

Pleasant

10.18

5.62

10.37

5.57

9.99

5.68

Neutral

4.60

4.91

4.59

4.90

4.61

4.93

Unpleasant

10.98

5.83

11.00

5.94

10.96

5.72

P300 (300–600 ms) Fz

369.64

0.44

24.17

22.60

Pleasant

2.71

7.29

2.99

7.43

2.41

7.15

Neutral

−2.69

6.51

−2.65

6.73

−2.72

6.29

Unpleasant

2.24

7.17

2.12

7.22

2.37

7.13

LPP (600–1000 ms) Pz

683.48

0.66

29.77

35.64

Pleasant

7.36

4.74

7.37

4.54

7.36

4.95

Neutral

2.01

4.01

1.92

4.19

2.11

3.81

Unpleasant

9.59

5.32

9.54

5.05

9.64

5.60

LPP (600–1000 ms) Fz

291.03

0.40

19.67

22.42

Pleasant

5.56

6.84

5.83

6.57

5.27

7.12

Neutral

0.43

6.04

0.32

6.26

0.54

5.81

Unpleasant

6.41

6.98

6.46

6.88

6.35

7.10

LPP (1000–2000 ms) Pz

199.78

0.33

14.38

19.30

Pleasant

3.24

4.18

3.36

4.06

3.11

4.30

Neutral

0.78

3.38

0.71

3.31

0.86

3.46

Unpleasant

4.33

4.43

4.37

4.14

4.29

4.71

LPP (1000–2000 ms) Fz

74.82

0.14

9.05

11.72

Pleasant

5.07

5.75

5.17

5.65

4.96

5.87

Neutral

2.69

5.04

2.49

5.10

2.90

4.98

Unpleasant

5.65

5.84

5.58

5.54

5.72

6.16

LPP (2000–3000 ms) Pz

58.33

0.12

8.85

9.69

Pleasant

1.87

3.89

2.00

3.89

1.73

3.90

Neutral

0.24

3.34

0.21

3.41

0.27

3.26

Unpleasant

2.12

4.13

2.07

3.93

2.18

4.33

LPP (2000–3000 ms) Fz

16.31

0.03

5.38

4.04

Pleasant

4.71

5.19

4.90

5.38

4.50

4.99

Neutral

3.25

4.65

3.11

4.95

3.41

4.31

Unpleasant

4.26

5.39

4.20

5.08

4.32

5.70

ERP variable	All subjects	MZ	DZ	Main effect of emotion F (2, 910)	η_p²	Pleasant vs neutral t(455)	Unpleasant vs neutral t(455)
EPN (175–275 ms) Oz							195.66	0.30	19.84	12.81
Pleasant	1.55	4.77	1.62	4.73	1.48	4.82
Neutral	3.55	4.65	3.57	4.59	3.53	4.71
Unpleasant	2.21	4.90	2.29	4.83	2.13	4.98
P300 (300–600 ms) Pz							697.43	0.65	33.68	33.86
Pleasant	10.18	5.62	10.37	5.57	9.99	5.68
Neutral	4.60	4.91	4.59	4.90	4.61	4.93
Unpleasant	10.98	5.83	11.00	5.94	10.96	5.72
P300 (300–600 ms) Fz							369.64	0.44	24.17	22.60
Pleasant	2.71	7.29	2.99	7.43	2.41	7.15
Neutral	−2.69	6.51	−2.65	6.73	−2.72	6.29
Unpleasant	2.24	7.17	2.12	7.22	2.37	7.13
LPP (600–1000 ms) Pz							683.48	0.66	29.77	35.64
Pleasant	7.36	4.74	7.37	4.54	7.36	4.95
Neutral	2.01	4.01	1.92	4.19	2.11	3.81
Unpleasant	9.59	5.32	9.54	5.05	9.64	5.60
LPP (600–1000 ms) Fz							291.03	0.40	19.67	22.42
Pleasant	5.56	6.84	5.83	6.57	5.27	7.12
Neutral	0.43	6.04	0.32	6.26	0.54	5.81
Unpleasant	6.41	6.98	6.46	6.88	6.35	7.10
LPP (1000–2000 ms) Pz							199.78	0.33	14.38	19.30
Pleasant	3.24	4.18	3.36	4.06	3.11	4.30
Neutral	0.78	3.38	0.71	3.31	0.86	3.46
Unpleasant	4.33	4.43	4.37	4.14	4.29	4.71
LPP (1000–2000 ms) Fz							74.82	0.14	9.05	11.72
Pleasant	5.07	5.75	5.17	5.65	4.96	5.87
Neutral	2.69	5.04	2.49	5.10	2.90	4.98
Unpleasant	5.65	5.84	5.58	5.54	5.72	6.16
LPP (2000–3000 ms) Pz							58.33	0.12	8.85	9.69
Pleasant	1.87	3.89	2.00	3.89	1.73	3.90
Neutral	0.24	3.34	0.21	3.41	0.27	3.26
Unpleasant	2.12	4.13	2.07	3.93	2.18	4.33
LPP (2000–3000 ms) Fz							16.31	0.03	5.38	4.04
Pleasant	4.71	5.19	4.90	5.38	4.50	4.99
Neutral	3.25	4.65	3.11	4.95	3.41	4.31
Unpleasant	4.26	5.39	4.20	5.08	4.32	5.70

Table 1

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Means (in µV) and standard deviations for ERP variables for all subjects (left columns) and for MZ and DZ twins separately (middle and right columns)

ERP variable	All subjects		MZ		DZ		Main effect of emotion F (2, 910)	η_p²	Pleasant vs neutral t(455)	Unpleasant vs neutral t(455)
ERP variable	M	SD	M	SD	M	SD	Main effect of emotion F (2, 910)	η_p²	Pleasant vs neutral t(455)	Unpleasant vs neutral t(455)
EPN (175–275 ms) Oz							195.66	0.30	19.84	12.81
Pleasant	1.55	4.77	1.62	4.73	1.48	4.82
Neutral	3.55	4.65	3.57	4.59	3.53	4.71
Unpleasant	2.21	4.90	2.29	4.83	2.13	4.98
P300 (300–600 ms) Pz							697.43	0.65	33.68	33.86
Pleasant	10.18	5.62	10.37	5.57	9.99	5.68
Neutral	4.60	4.91	4.59	4.90	4.61	4.93
Unpleasant	10.98	5.83	11.00	5.94	10.96	5.72
P300 (300–600 ms) Fz							369.64	0.44	24.17	22.60
Pleasant	2.71	7.29	2.99	7.43	2.41	7.15
Neutral	−2.69	6.51	−2.65	6.73	−2.72	6.29
Unpleasant	2.24	7.17	2.12	7.22	2.37	7.13
LPP (600–1000 ms) Pz							683.48	0.66	29.77	35.64
Pleasant	7.36	4.74	7.37	4.54	7.36	4.95
Neutral	2.01	4.01	1.92	4.19	2.11	3.81
Unpleasant	9.59	5.32	9.54	5.05	9.64	5.60
LPP (600–1000 ms) Fz							291.03	0.40	19.67	22.42
Pleasant	5.56	6.84	5.83	6.57	5.27	7.12
Neutral	0.43	6.04	0.32	6.26	0.54	5.81
Unpleasant	6.41	6.98	6.46	6.88	6.35	7.10
LPP (1000–2000 ms) Pz							199.78	0.33	14.38	19.30
Pleasant	3.24	4.18	3.36	4.06	3.11	4.30
Neutral	0.78	3.38	0.71	3.31	0.86	3.46
Unpleasant	4.33	4.43	4.37	4.14	4.29	4.71
LPP (1000–2000 ms) Fz							74.82	0.14	9.05	11.72
Pleasant	5.07	5.75	5.17	5.65	4.96	5.87
Neutral	2.69	5.04	2.49	5.10	2.90	4.98
Unpleasant	5.65	5.84	5.58	5.54	5.72	6.16
LPP (2000–3000 ms) Pz							58.33	0.12	8.85	9.69
Pleasant	1.87	3.89	2.00	3.89	1.73	3.90
Neutral	0.24	3.34	0.21	3.41	0.27	3.26
Unpleasant	2.12	4.13	2.07	3.93	2.18	4.33
LPP (2000–3000 ms) Fz							16.31	0.03	5.38	4.04
Pleasant	4.71	5.19	4.90	5.38	4.50	4.99
Neutral	3.25	4.65	3.11	4.95	3.41	4.31
Unpleasant	4.26	5.39	4.20	5.08	4.32	5.70

ERP variable	All subjects		MZ		DZ		Main effect of emotion F (2, 910)	η_p²	Pleasant vs neutral t(455)	Unpleasant vs neutral t(455)
ERP variable	M	SD	M	SD	M	SD	Main effect of emotion F (2, 910)	η_p²	Pleasant vs neutral t(455)	Unpleasant vs neutral t(455)
EPN (175–275 ms) Oz							195.66	0.30	19.84	12.81
Pleasant	1.55	4.77	1.62	4.73	1.48	4.82
Neutral	3.55	4.65	3.57	4.59	3.53	4.71
Unpleasant	2.21	4.90	2.29	4.83	2.13	4.98
P300 (300–600 ms) Pz							697.43	0.65	33.68	33.86
Pleasant	10.18	5.62	10.37	5.57	9.99	5.68
Neutral	4.60	4.91	4.59	4.90	4.61	4.93
Unpleasant	10.98	5.83	11.00	5.94	10.96	5.72
P300 (300–600 ms) Fz							369.64	0.44	24.17	22.60
Pleasant	2.71	7.29	2.99	7.43	2.41	7.15
Neutral	−2.69	6.51	−2.65	6.73	−2.72	6.29
Unpleasant	2.24	7.17	2.12	7.22	2.37	7.13
LPP (600–1000 ms) Pz							683.48	0.66	29.77	35.64
Pleasant	7.36	4.74	7.37	4.54	7.36	4.95
Neutral	2.01	4.01	1.92	4.19	2.11	3.81
Unpleasant	9.59	5.32	9.54	5.05	9.64	5.60
LPP (600–1000 ms) Fz							291.03	0.40	19.67	22.42
Pleasant	5.56	6.84	5.83	6.57	5.27	7.12
Neutral	0.43	6.04	0.32	6.26	0.54	5.81
Unpleasant	6.41	6.98	6.46	6.88	6.35	7.10
LPP (1000–2000 ms) Pz							199.78	0.33	14.38	19.30
Pleasant	3.24	4.18	3.36	4.06	3.11	4.30
Neutral	0.78	3.38	0.71	3.31	0.86	3.46
Unpleasant	4.33	4.43	4.37	4.14	4.29	4.71
LPP (1000–2000 ms) Fz							74.82	0.14	9.05	11.72
Pleasant	5.07	5.75	5.17	5.65	4.96	5.87
Neutral	2.69	5.04	2.49	5.10	2.90	4.98
Unpleasant	5.65	5.84	5.58	5.54	5.72	6.16
LPP (2000–3000 ms) Pz							58.33	0.12	8.85	9.69
Pleasant	1.87	3.89	2.00	3.89	1.73	3.90
Neutral	0.24	3.34	0.21	3.41	0.27	3.26
Unpleasant	2.12	4.13	2.07	3.93	2.18	4.33
LPP (2000–3000 ms) Fz							16.31	0.03	5.38	4.04
Pleasant	4.71	5.19	4.90	5.38	4.50	4.99
Neutral	3.25	4.65	3.11	4.95	3.41	4.31
Unpleasant	4.26	5.39	4.20	5.08	4.32	5.70

Note: P < 0.001 for all comparisons. Also shown are analysis of variance results for effects of emotion on each ERP variable, at relevant scalp sites.

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